When a male ejaculates inside of a female while having unprotected sex.

Bob: Dude, you were wasted last night! Did you hook up with that girl?
Carl: Yea! It was Awesome
Bob: Did you atleast were a rubber?
Carl: No, she was on the pill.
Bob: So... I guess you dropped a baby bomb?
Carl: Yea, It just feels so good once I start.